Weed Veez

Weed trading has a very large number in the United States. This paper attempts to explore the trends and influencing factors of weed transactions through changes in the price of weed (high,medium and low quality) in the US states in 2014-2017.


1 Raw Data


First, let’s take a look at the weed prices per state in 2014 (three different qualities). We’ll use a datatable to look at the dataset’s general structure.


The quality rows ending with N just represent how many prices were submitted for that specific day in that particular state. We do not use this information in this study.


It is uneasy to get a nice representation of the data in this form.

So let’s get a look at the trend of the prices through a simple line plot !

3 Comparison of different prices of cannabis per quality in different states（high, medium and low quality).

To compare the prices between states, we can first look at these 3 particular states and their prices for high quality weed in a violin chart. The point with a violin chart is that it enables us to see the spread of the prices values and how many there are data.
We chose Alabama, Hawaii and Nevada for no specific reason. These states can easily be changed in the code.

Plotting every single state on a violin chart is not very legible. Using treemaps is a nice way to order the prices per state and compare them.
These 3 treemaps show the mean of each quality per state.


It can be seen that the prices of low quality cannabis are very widely spread, maybe because of some scams. However, for better qualities, the prices are heterogeneous. One can think that the good quality weed is provided by reliable sources with homogeneous prices.

The treemaps are a little difficult to see the differences of price between states. Maybe there is another chart that can show us the data more clearly…

4 States prices comparison



To compare the prices between states, it is easier if one has every data needed at the same place. This is why we chose to implement a lollipop chart that can show the maximal mean, mean of all the means and minimum mean prices per state as well as the median state.

Important note : This chart can be easily changed in the code to represent the mean of high, medium or low quality instead of the mean of the 3 by only changing the value of the variable Choix.


Obviously, there is a large gap between the states’ cannabis prices, which may be due to the difficulty to import weed or to the taxes in some states.

Finally, we’ll look at the deviation of the cannabis prices between states through an interactive map chart. A map chart will give us a very meaningful representation of our data.


Here, the map only represents the mean of all prices per state. The means of every quality per state can be seen by moving the mouse above one given state.

5 Conclusion

To conclude, we can say that weed is expensive and that you can buy much more things with that much money than just an once of weed of bad quality…